Yamaha Mt 01 T 2005 Manual

							IMMOBILIZER SYSTEM
7-76
3. Main switch
4. Battery
8. Main fuse
10.ECU fuse
11.Immobilizer unit
12.Backup fuse (odometer, clock and immobilizer 
system)
29.ECU (electronic control unit)
44.Multi-function meter
46.Immobilizer system indicator light
81.Ignition fuse 
						

							IMMOBILIZER SYSTEM
7-77
EAS27670GENERAL INFORMATION
This vehicle is equipped with an immobilizer system to help prevent theft by re-registering codes in the 
standard keys. This system consists of the following:
a code re-registering key (with a red bow)
two standard keys (with a black bow) that can be re-registered with new codes
a transponder (installed in the red key bow)
an immobilizer unit
the ECU
an immobilizer system indicator light
The key with the red bow is used to register codes in each standard key. Do not use the key with the 
red bow for driving. It should only be used for re-registering new codes in the standard keys. The im-
mobilizer system cannot be operated with a new key until the key registered with a code. If you lose the 
code re-registering key, the ECU and main switch (equipped with the immobilizer unit) need to be re-
placed.
Therefore, always use a standard key for driving. (See caution below.)
NOTE:
Each standard key is registered during production, therefore re-registering at purchase is not neces-
sary.
CAUTION:
EC5YU1026
DO NOT LOSE THE CODE RE-REGISTERING KEY! If the code re-registering key is lost, regis-
tering new codes in the standard keys is impossible. The standard keys can still be used to 
start the vehicle. However, if code re-registering is required (e.g., if a new standard key is made 
or all keys are lost) the entire immobilizer system must be replaced. Therefore, it is highly rec-
ommended to use either standard key for driving, and to keep the code re-registering key in a 
safe place.
Do not submerse the keys in water.
Do not expose the keys to excessively high temperatures.
Do not place the keys close to magnets (this includes, but is not limited to, products such as 
speakers, etc.).
Do not place heavy items on the keys.
Do not grind the keys or alter their shape.
Do not disassemble the key bows.
Do not put two keys of any immobilizer system on the same key ring.
Keep the standard keys as well as other immobilizer system keys away from the code re-reg-
istering key.
Keep other immobilizer system keys away from the main switch as they may cause signal in-
terference.
EAS27690
PART REPLACEMENT AND KEY CODE REGISTRATION REQUIREMENTS
In the course of use, you may encounter the following cases where replacement of parts and registra-
tion of code re-registering/standard keys are required.
NOTE:
Each standard key is registered during production, therefore re-registering at purchase is not neces-
sary. 
						

							IMMOBILIZER SYSTEM
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* Accessory locks mean the seat lock and fuel tank cap.
Code re-registering key registration:
When the immobilizer unit or ECU is replaced, the code re-registering key must be registered to the 
unit.
To register a code re-registering key:
1. Turn the main switch to “ON” with the code re-registering key.
NOTE:
Check that the immobilizer system indicator light comes on for one second, then goes off. When the 
immobilizer system indicator light goes off, the code re-registering key has been registered.
2. Check that the engine can be started.
3. Register the standard key, following the instructions in the section below.
Standby mode:
To enable the immobilizer system, turn the ignition key to “OFF”. 30 seconds later, the indicator light 
will start flashing continuously in the standby flashing mode pattern for up to 24 hours. After that time, 
the indicator light will stop flashing, but the immobilizer system is still enabled.Parts to be replaced
Key registration re-
quirement Main switch/immo-
bilizer unit
Standard 
keyECUAccesso-
ry lock* 
and key Main 
switchImmobiliz-
er unit
Standard key is lost√New standard key
All keys have been 
lost (including code 
re-registering key)√ √√√Code re-registering 
key and standard 
keys
ECU is defective√Code re-registering 
key and standard 
keys
Immobilizer unit is 
defective√Code re-registering 
key and standard 
keys
Main switch is 
defective√ √√√Code re-registering 
key and standard 
keys
Accessory lock* is 
defective√Not required 
						

							IMMOBILIZER SYSTEM
7-79
Standby mode
Standard key registration:
Standard key registration is required when a standard key is lost and needs to be replaced, or when 
the code re-registering key is re-registered after the immobilizer unit or ECU are replaced.
NOTE:
Do not start the engine with a standard key that has not been registered. If the main switch is turned 
“ON” with a standard key that has not been registered, the immobilizer system indicator light flashes to 
indicate fault code “52”. (Refer to “SELF-DIAGNOSIS FAULT CODE INDICATION” on page 7-81).
1. Check that the immobilizer system indicator light signals the standby mode.
2. Using the code re-registering key, turn the main switch to “ON”, then “OFF”, and then remove the 
key within 5 seconds.
3. Insert the first standard key to be registered into the main switch, then turn the key to “ON” within 5 
seconds to activate the key registration mode.
NOTE:
The existing standard key code is erased from the memory when the key registration mode is activated. 
When the key registration mode is activated, the immobilizer system indicator light flashes rapidly.
4. While the indicator light is flashing, turn the main switch to “OFF”, remove the key, and within 5 sec-
onds, insert the second standard key to be registered into the main switch.
NOTE:
If he immobilizer system indicator light stops flashing 5 seconds after the first standard key is registered, 
the registration mode is deactivated. If this occurs, the second standard key cannot be registered, and 
steps 2 to 4 need to be repeated to register both standard keys.
5. Turn the main switch to “ON”.
NOTE:
When the indicator light goes off, the registration is complete.
6. Check that the engine can be started with the two registered standard keys.
a. Main switch “ON”
b. Main switch “OFF”
c. LED ond. LED off
e. Standby mode on
f. Standby mode off 
						

							IMMOBILIZER SYSTEM
7-80
Standard key registration
Voiding the standard key code:
If a standard key has been lost, it is possible to disable its use by re-registering the remaining standard 
key. Standard key registration erases the stored standard key code from the memory, thus disabling 
the lost standard key.To re-register, refer to “Standard key registration”.
Standard key code voiding method
a. Main switch “ON”
b. Main switch “OFF”
c. LED on
d. LED off
e. Less than 5.0 s
f. Code re-registering keyg. First standard key
h. Second standard key
i. Registration mode
A. Registration of the second standard key is 
complete.
B. Immobilizer system indicator light stops 
flashing when the registration of the second 
standard key is complete.
a. Main switch “ON”
b. Main switch “OFF”
c. LED on
d. LED off
e. Less than 5.0 sf. Code re-registering key
g. Remaining standard key
h. Registration mode
A. If the immobilizer system indicator light stops 
flashing 5 seconds after the first standard key 
is registered, the second standard key cannot 
be registered. 
						

							IMMOBILIZER SYSTEM
7-81
EAS27700TROUBLESHOOTING
When the main switch is turned to “ON”, the immobilizer system indicator light does not come on nor 
flashes.
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
 
 NG →
OK ↓
EAS27720SELF-DIAGNOSIS FAULT CODE INDICATION
When a system malfunction occurs, the fault code number is signaled by the immobilizer system indi-
cator light.1. Check the fuses.
(Main, ignition, backup, and ECU)
Refer to “CHECKING THE FUSES” 
on page 7-93.Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND 
CHARGING THE BATTERY” on 
page 7-94.Clean the battery terminals.
Recharge or replace the battery.
3. Check the main switch.
Refer to “CHECKING THE 
SWITCHES” on page 7-89.Replace the main switch/immobilizer unit.
4. Check the entire immobilizer 
system wiring.
Refer to “CIRCUIT DIAGRAM” on 
page 7-75.Properly connect or repair the immobilizer 
system wiring.
Check the condition of the each 
immobilizer system circuits.
Refer to “SELF-DIAGNOSIS FAULT 
CODE INDICATION” on page 7-81.
Fault 
codePart Symptom Cause Action
51 IMMOBILIZER 
UNITCode cannot be 
transmitted between 
the key and the 
immobilizer unit.1. Radio wave 
interference caused 
by objects around the 
keys and antenna.
2. Immobilizer unit 
malfunction.
3. Key malfunction.1. Keep magnets, 
metal objects, 
and other 
immobilizer 
system keys 
away from the 
keys and 
antennas.
2. Replace the 
main switch/im-
mobilizer unit.
3. Replace the key. 
						

							IMMOBILIZER SYSTEM
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Immobilizer system indicator light fault code indication
Units of 10: Cycles of on for 1 second and off for 1.5 seconds.
Units of 1: Cycles of on for 0.5 second and off for 0.5 second.52 IMMOBILIZER 
UNITCodes between the 
key and immobilizer 
unit do not match.1. Signal received from 
other transponder 
(failed to recognize 
code after ten 
consecutive 
attempts).
2. Signal received from 
unregistered 
standard key.1. Place the 
immobilizer unit 
at least 50 mm 
away from the 
transponder of 
other vehicles.
2. Register the 
standard key.
53 IMMOBILIZER 
UNITCodes cannot be 
transmitted between 
the ECU and the 
immobilizer unit.Noise interference or 
disconnected 
lead/cable.
1. Interference due to 
radio wave noise.
2. Disconnected 
communication 
harness.
3. Immobilizer unit 
malfunction.
4. ECU malfunction.1. Check the wire 
harness and 
connector.
2. Replace the 
main switch/im-
mobilizer unit.
3. Replace the 
ECU.
54 IMMOBILIZER 
UNITCodes transmitted 
between the ECU 
and the immobilizer 
unit do not match.Noise interference or 
disconnected 
lead/cable.
1. Interference due to 
radio wave noise.
2. Disconnected 
communication 
harness.
3. Immobilizer unit 
malfunction.
4. ECU failure.
(The ECU or 
immobilizer unit was 
replaced with a used 
unit from another 
vehicle.)1. Register the 
code re-
registering key.
2. Check the wire 
harness and 
connector.
3. Replace the 
main switch/im-
mobilizer unit.
4. Replace the 
ECU.
55 IMMOBILIZER 
UNITKey code 
registration 
malfunction.Same standard key was 
attempted to be 
registered two 
consecutive times.Register another 
standard key.
56 ECU Unidentified code is 
received.Noise interference or 
disconnected 
lead/cable.1. Check the wire 
harness and 
connector.
2. Replace the 
main switch/im-
mobilizer unit.
3. Replace the 
ECU. Fault 
codePart Symptom Cause Action 
						

							IMMOBILIZER SYSTEM
7-83
Example: fault code 52
a
b
a. Light on
b. Light off 
						

							IMMOBILIZER SYSTEM
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							ELECTRICAL COMPONENTS
7-85
EAS27970
ELECTRICAL COMPONENTS
4
35
7
6
8
9
10
12
13 14 1512
11